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Byju's Answer

Standard XII

Chemistry

Introduction to Alkenes

Assertion :Ex...

Question

Assertion :Expected major product from the given reaction is as shown. Reason: With increase in electrophilicity on > C=O group. rate of attack of nucleophile increases.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is incorrect but Reason is correct

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Both Assertion and Reason are correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
This is an example of crossed cannizzaro reaction in which the aromatic aldehyde is reduced to alcohol and the aliphatic aldehyde is oxidized to alcohol.
With increase in electrophilicity on > C=O group. rate of attack of nucleophile increases.
Thus, Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Q. Assertion: The compressibility factor for

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and

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(1 + \frac{P b}{R T})

Reason: The compressibility factor for

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Q. For the following Assertion and Reason, the correct option is:
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Reason: The dissociation of water into

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an exothermic reaction.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

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